P0231
PowertrainFuel Systemhigh severityFuel Pump Secondary Circuit Low
What P0231 Means
Low voltage in the fuel pump secondary (output) circuit.
Symptoms
- Engine stalling
- No start
- Loss of power at high RPM
Common Causes
- Fuel pump failing
- Corroded connector
- High resistance wiring
- Weak battery during cranking
Diagnostic Steps
- Test voltage at pump connector
- Check connector
- Measure current draw
Where to start: Replace fuel pump or repair wiring.
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